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If \\(f(x)=\\sqrt{x}\\) and \\(g(x)=\\frac{1}{\\sqrt{4-x}}\\), what is the domain of the product function \\((fg)(x)\\)?

Answer and explanation

Correct answer: \\(0\\le x<4\\)

The product is \\((fg)(x)=\\frac{\\sqrt{x}}{\\sqrt{4-x}}\\). The function \\(f(x)\\) requires \\(x\\ge0\\). Since \\(\\sqrt{4-x}\\) is in the denominator, it must be strictly positive, so \\(4-x>0\\), or \\(x<4\\). The intersection of these conditions is \\(0\\le x<4\\), making option A correct. Option C misses the necessary restriction \\(x<4\\). Exam tip: For a product or quotient of functions, find the domain by intersecting all individual domain restrictions and excluding zero denominators.

Related tags

Relations-FunctionsAlgebra-Real-FunctionsDomainProduct-FunctionsReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematics

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